HS 1-Associated Protein X-1 Is Cleaved by Caspase-3 During Apoptosis

  • Lee, Ah Young (Translational Research Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Lee, Yoora (Translational Research Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Park, Yun Kyung (Translational Research Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Bae, Kwang-Hee (Translational Research Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Cho, Sayeon (College of Pharmacy, Chung-Ang University) ;
  • Lee, Do Hee (Translational Research Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Park, Byoung Chul (Translational Research Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Kang, Sunghyun (Translational Research Center, Korea Research Institute of Bioscience and Biotechnology) ;
  • Park, Sung Goo (Translational Research Center, Korea Research Institute of Bioscience and Biotechnology)
  • Received : 2007.07.03
  • Accepted : 2007.08.16
  • Published : 2008.02.29

Abstract

Caspase-3 (CASP3) plays a key role in apoptosis. In this study, HAX-1 was identified as a new substrate of CASP3 during apoptosis. HAX-1 was cleaved by CASP3 during etoposide-(ETO) induced apoptosis, and this event was inhibited by a CASP3-specific inhibitor. The cleavage site of HAX-1, at $Asp^{127}$, was located using N-terminal amino acid sequencing of in vitro cleavage products of recombinant HAX-1. Overexpression of HAX-1 inhibited ETO-induced apoptotic cell death. It also inhibited CASP3 activity. Together, these results suggest that HAX-1, a substrate of CASP3, inhibits the apoptotic process by inhibiting CASP3 activity.

Keywords

Apoptosis;Caspase-3;HAX-1

Acknowledgement

Supported by : Korea Research Institute of Bioscience and Biotechnology, Korea Science and Engineering Foundation

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